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CaMKII biophysics and its role in LTP

CaMKII 生物物理学及其在 LTP 中的作用

基本信息

批准号：
10333321
负责人：
Margaret M Stratton
金额：
$ 31.29万
依托单位：
UNIVERSITY OF MASSACHUSETTS AMHERST
依托单位国家：
美国
项目类别：
财政年份：
2018
资助国家：
美国
起止时间：
2018-01-01 至 2023-11-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10333321
关键词：
Address Affect Alzheimer&apos s Disease Animals Biochemical Biochemistry Biological Assay Biophysics Biosensor Brain Cell Culture Techniques Cells Cellular biology Data Defect Dendrites Dependence Disease Progression Enzymes Event Frequencies Future Gene Expression Goals Hand Hippocampus (Brain)Holoenzymes In Vitro Learning Length Long-Term Potentiation Maintenance Mammalian Cell Measures Memory Modeling Molecular Monitor Mutation Neurons Pathology Pathway interactions Phosphorylation Phosphotransferases Physiologic pulse Physiological Play Positioning Attribute Process Property Protein Isoforms Proteins Regulation Regulatory Pathway Research Role Signal Pathway Signal Transduction Site Stimulus Synapses Synaptic Transmission System Time Transgenic Mice Traumatic Brain Injury Work biophysical properties calmodulin-dependent protein kinase II experience fascinate improved in vivo long term memory nervous system disorder neurotransmission novel programs protein degradation protein structure recruit shared memory

项目摘要

PROJECT SUMMARY How does a memory outlast the lifetime of the molecule that encodes it? More than two decades ago, Francis Crick had the foresight to speculate that perhaps a multimeric protein could serve as a molecular memory by sharing its activation state with newly synthesized proteins through subunit exchange in order to store a memory for years. Ca2+-calmodulin dependent protein kinase II (CaMKII) was identified as an enzyme that may fit this description. For example, mutation of CaMKII at sites critical for its function results in severe learning and memory defects. CaMKII is activated at a threshold neuronal spike frequency and is crucial to long-term potentiation (LTP). A major obstacle to understanding LTP is the absence of understanding how regulatory pathways recruited during this initial high-frequency stimulus are able to remain persistently active in the face of ongoing protein turnover. Our recent work has shown that CaMKII exchanges subunits between holoenzymes in an activation-dependent manner. Importantly, kinase activity is conferred to unactivated CaMKII holoenzymes by trans-phosphorylation as a consequence of subunit exchange, thereby potentiating the activation signal past the time of protein degradation. This cycle may continue indefinitely. Our work is aimed to further investigate this phenomenon, specifically in respect to its role in LTP. Our major research goals are to: 1) understand the role of the unique biophysical properties of CaMKII (how linker length affects activation, frequency dependence and subunit exchange) that contribute to its potential for being a `memory molecule,' and 2) investigate the properties of CaMKII (such as subunit exchange and changes in gene expression) in cellular systems to determine its physiological role in LTP. These challenging goals require the synthesis of information obtained from the molecular level (protein structure and regulation) to the cellular level (mammalian cell culture) and finally to the animal level (transgenic mice), which will be for future study. Completion of the proposed work will allow us to better address neurologic disease progression as it affects memory, such as pathologies seen in Alzheimer's, dementia, and traumatic brain injury.

项目总结